Morrowind is available on android as the app OMW Nightly and is arguably one of the greatest RPGs ever made.

Just have to download the game data file, which is freely available online. https://archive.org/details/morrowind_free_download

I know you specifically asked for not this but its the only game i know that is a good rpg on mobile. You could play old school Runescape. Its essentially single player since there aren't many parts of the game that require co operation. You will see other players walking around the world and talking but you can turn public chat off so you never need to see anything they say. The game is incredibly light on data usage since it was designed as a browser game in the 2000s.

Apparently quite a few people play Cataclysm DDA on android.

Exiled Kingdoms - it's a labor-of-love project inspired by classic 90s RPGs. I've played through it a few times, it's solid.

That looks really good

C. Kane. Its a comedic ROG heavily inspired by the movie Citizen Kane. (also set in a posts apocalyptic USA)

I forgot all about that one

The only thing I could find is Kane International

I used to play that. It was pretty good. I just downloaded Diablo Immortal again. It's hard to find something like it. Other games I like are Eternium and Anima.

I liked Knights of Pen and Paper which is a turn based RPG in which your characters are Tabletop Players